Xylem WTW Turb 750 IR User manual

OPERATING MANUAL
ba77233e05 06/2023
750 T
Turb
Turb®750 IR/T
LAB TURBIDIMETER
OPERATING MANUAL

2ba77233e05 06/2023
Turb®750 IR/T
Copyright © 2023 Xylem Analytics Germany GmbH
Printed in Germany.

Turb®750 IR/T Contents
3
ba77233e05 06/2023
Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.1 Safety information in the operating manual . . . . . . . . . 9
2.1.2 Safety signs on the meter . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.3 Further documents providing safety information . . . . . 9
2.2 Safe operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.2 Requirements for safe operation . . . . . . . . . . . . . . . . 10
2.2.3 Unauthorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.1 Inserting the batteries . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.2 Connecting the power pack . . . . . . . . . . . . . . . . . . . . 12
3.3 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Switching on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 User administration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Login with user name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 Inserting a cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.5 Preparing the cell and sample . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.5.1 Preparing the cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5.2 Preparing the sample . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.6 General operating principles . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.6.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6.2 Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6.3 Navigation example 1: Setting the language . . . . . . . 21
4.6.4 Example 2 on navigation: Setting the date and time . 22
4.6.5 Example 3 on navigation: Entering numerals and text 23
4.7 System settings (System menu) . . . . . . . . . . . . . . . . . . . . . . . 28
4.7.1 Measured value memory . . . . . . . . . . . . . . . . . . . . . . 28
4.7.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.7.3 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.7.4 Date/time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.8 Measuring the turbidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.8.1 Settings for turbidity measurement . . . . . . . . . . . . . . . 33
4.9 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Contents Turb®750 IR/T
4ba77233e05 06/2023
4.9.1 Settings for calibration . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.9.2 Entering lot numbers for calibration standards . . . . . . 36
4.9.3 Carrying out a calibration . . . . . . . . . . . . . . . . . . . . . . 38
4.10 Analytical quality assurance ( AQA ) . . . . . . . . . . . . . . . . . . . . . 41
4.10.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.10.2 Settings for quality assurance ( AQA ) . . . . . . . . . . . . . 41
4.10.3 Entering lot numbers for AQA standards . . . . . . . . . . 43
4.10.4 Carrying out the AQA check . . . . . . . . . . . . . . . . . . . . 45
4.11 Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.11.1 Storing measurement datasets . . . . . . . . . . . . . . . . . . 47
4.11.2 Filtering measurement datasets . . . . . . . . . . . . . . . . . 48
4.11.3 Displaying measurement datasets . . . . . . . . . . . . . . . 49
4.11.4 Outputting measurement datasets to the interfaces . . 49
4.11.5 Erasing stored measurement datasets . . . . . . . . . . . . 50
4.12 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
4.12.1 Establishing the connection to a PC . . . . . . . . . . . . . . 50
4.12.2 Data transmission with the PC software Turb®Data . 51
4.12.3 Data transmission with the Excel add-in
MultiLab®Importer . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4.12.4 Configuration for the data transmission to a terminal
program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4.12.5 Establishing the connection to a printer . . . . . . . . . . . 53
4.12.6 Starting the data transmission at the Turb®750 IR/T
(at MultiLab®Importer, printer, terminal program . . . . 54
4.12.7 Examples of data transmitted (printer, terminal
program) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.13 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.13.1 Resetting the system settings . . . . . . . . . . . . . . . . . . . 55
4.13.2 Resetting turbidimeter settings . . . . . . . . . . . . . . . . . . 56
4.14 Meter information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.15 Software update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
5 Maintenance, cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
5.2.1 Cleaning the cell shaft . . . . . . . . . . . . . . . . . . . . . . . . . 59
5.2.2 Cleaning the cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
5.3 Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
6.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
6.2 Turbidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.2 Turbidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7.2.1 Turb®750 IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7.2.2 Turb®750 T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Turb®750 IR/T Contents
5
ba77233e05 06/2023
8 Accessories and options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
9 Firmware update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
10 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
11 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
12 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Overview Turb®750 IR/T
6ba77233e05 06/2023
1Overview
1.1 General features
The compact Turb®750 IR/T precision lab turbidimeter enables you to carry
out turbidity measurements quickly and reliably.
The Turb®750 IR/T lab turbidimeter provides the maximum degree of ease
of operation, reliability and measuring certainty for all applications.
You will find information on available literature in the WTW catalog or on the
Internet at www.xylemanalytics.com.
1 Keypad
2 Display
3 Cell shaft
4 Connectors
If you need further information or application notes, you can ob-
tain the following material from WTW:
Application reports
Primers
Safety datasheets.
750 T
Turb
1
2
4
3

Turb®750 IR/T Overview
7
ba77233e05 06/2023
1.2 Keypad
In this operating manual, keys are indicated by brackets <..> .
The key symbol (e.g. <STO (0) >) generally indicates a short keystroke (under
2 sec) in this operating manual. A long keystroke (approx. 2 sec) is indicated
by the underscore behind the key symbol (e.g. <STO (0) _>).
Key functions <M (9)>Switch to the measured value display
<CAL (4)>Start calibration
<QuickCAL (1)>Start simplified calibration with one standard.
<AQA (2)>Start the checking of the meter with AQA stan-
dards
The key is only active if any AQA checks were
activated.
<A-Z (5)_> Select the entry mode in an entry field
Numerical or alphanumerical entry
<A-Z (5)>Display the next digit in an entry field with active
alphanumeric entry
(same function as <V (6) >)
<START/ENTER (.)>Open menus / confirm entries /
start measurement
<MENU (7)>Call up the Configuration menu
(all settings are made here)
<On/Off> Switch the meter on or off
<PRT (8)>Output display contents to RS232 or USB inter-
face (e.g. print)
<STO (0)>Open the Store menu: <STO (0) >
Quick storing: 2 x <STO (0) >
<STO (0) _> Open the measured value memory
<V (6)>, <W (3)> Highlight menu items or selection;
Set values
<ESC> Switch to the next higher menu level /
cancel input
Entering numerals with the number keys (see EXAMPLE 3 ON NAV-
IGATION: ENTERING NUMERALS AND TEXT, page 23).

Overview Turb®750 IR/T
8ba77233e05 06/2023
1.3 Display
The graphic display shows all information of the current measurement in the
measured value display. The illumination enables to read the display even in
the dark.
Example
1.4 Socket field
1 Status display indicators, e.g.:
[IRPC] = Intelligent reproducibility and plausibility check
[AQA] = Valid AQA check available
2 Measured value (with unit)
3 Status display indicators, e.g.
[3-P StdCAL] = Valid calibration available
(calibration type: 3-P StdCAL))
4 Status line with date and time
1 USB-B (micro) interface
2 Power pack
3 RS232 (serial) interface
Only one cable may be connected to an interface (RS232 or
USB) at a time.
1
2
3
4
Turbidity
[IRPC] [AQA]
157.0
FNU
NTU
[3-P StdCAL]
15.01.20 16:12
3
1 2

Turb®750 IR/T Safety
9
ba77233e05 06/2023
2 Safety
2.1 Safety information
2.1.1 Safety information in the operating manual
This operating manual provides important information on the safe operation
of the meter. Read this operating manual thoroughly and make yourself fa-
miliar with the meter before putting it into operation or working with it. The op-
erating manual must be kept in the vicinity of the meter so you can always
find the information you need.
Important safety instructions are highlighted in this operating manual. They
are indicated by the warning symbol (triangle) in the left column. The signal
word (e.g. "CAUTION") indicates the level of danger:
NOTE
indicates a possibly dangerous situation where goods might be
damaged if the actions mentioned are not taken.
2.1.2 Safety signs on the meter
Note all labels, information signs and safety symbols on the meter and in the
battery compartment. A warning symbol (triangle) without text refers to safety
information in this operating manual.
2.1.3 Further documents providing safety information
The following documents provide additional information, which you should
observe for your safety when working with the measuring system:
• Operating manuals of further accessories
• Safety datasheets of calibration or maintenance accessories (such as
buffer solutions, electrolyte solutions, etc.)
WARNING
indicates a possibly dangerous situation that can lead to seri-
ous (irreversible) injury or death if the safety instruction is not
followed.
CAUTION
indicates a possibly dangerous situation that can lead to
slight (reversible) injury if the safety instruction is not fol-
lowed.

Safety Turb®750 IR/T
10 ba77233e05 06/2023
2.2 Safe operation
2.2.1 Authorized use
This meter is authorized exclusively for turbidity measurements in the labo-
ratory.
Only the operation and running of the meter according to the instructions and
technical specifications given in this operating manual is authorized (see
chapter 7 TECHNICAL DATA).
Any other use is considered unauthorized.
2.2.2 Requirements for safe operation
Note the following points for safe operation:
• The meter may only be operated according to the authorized use specified
above.
• The meter may only be supplied with power by the energy sources
mentioned in this operating manual.
• The meter may only be operated under the environmental conditions
mentioned in this operating manual.
• The meter may only be opened if this is explicitly described in this oper-
ating manual (example: Inserting the batteries).
2.2.3 Unauthorized use
The meter must not be put into operation if:
• it is visibly damaged (e.g. after being transported)
• it was stored under adverse conditions for a lengthy period of time (storing
conditions, see chapter 7 TECHNICAL DATA).
CAUTION
Danger of eye damage by visible and invisible LED radiation.
In the cell shaft of the Turb®750 IR there are light emitting
diodes (LEDs) of the 1M class.
Do not look at the radiation using optical instruments.
With normal, authorized use there is no hazard.

Turb®750 IR/T Commissioning
11
ba77233e05 06/2023
3 Commissioning
3.1 Scope of delivery
Lab turbidimeter Turb®750 IR or Turb®750 T
4 batteries 1.5 V type AA
Power pack with Euro plug
and exchange plugs for USA, UK, and Australia
Cable USB-A to USB-B (micro)
6 empty cells 28 mm
with label to mark the cell
AMCO®-Clear turbidity standard
Microfiber cloth to clean the meter
Compact operating manual and short operating manual
CD-ROM with detailed operating manual
CD-ROM with software Turb®Data
3.2 Power supply
The Turb®750 IR/T is supplied with power by the power pack included in the
scope of delivery. The batteries (4 batteries 1.5 V Mignon type AA) in the bat-
tery compartment supply the integrated clock with power when the power
supply is missing.
3.2.1 Inserting the batteries
1 Battery compartment
1. Open the battery compartment (1) on the underside of the meter.
1

Commissioning Turb®750 IR/T
12 ba77233e05 06/2023
NOTE
Make sure that the poles of the batteries are positioned correctly.
The ± signs on the batteries must correspond to the ± signs in the bat-
tery compartment.
3.2.2 Connecting the power pack
3.3 Initial commissioning
Perform the following activities:
Insert the batteries (see section 3.2.1)
Connect the power pack (see section 3.2.2)
Set the language as necessary (see section 4.6.3)
Set the date and time as necessary (see section 4.6.4)
2. Place four batteries (type Mignon AA) in the battery compartment.
3. Close the battery compartment (1).
4. Set the date and time
(see section 4.5.5).
WARNING
The line voltage at the operating site must lie within the input
voltage range of the original power pack (see chapter
7T
ECHNICAL DATA).
Use original power packs only (see chapter 7 TECHNICAL DA-
TA).
1 If necessary, replace the Euro plug of the power pack with the coun-
try-specific plug suitable for your country.
2 Insert the plug of the power pack into the socket of the turbidimeter.
3 Connect the power pack unit to an easily accessible mains socket.
When you set the language, date and time according to the men-
tioned sections of this operating manual you will quickly become
familiar with the simple operation of the Turb®750 IR/T.

Turb®750 IR/T Operation
13
ba77233e05 06/2023
4 Operation
4.1 Switching on the meter
Switching on Press the <On/Off> key.
The Start menu appears for 30 seconds.
The status line indicates the meter designation and the version number of the
software.
After a few seconds the meter automatically switches to the measuring mode.
Switching off Press the <On/Off> key.
4.2 User administration
The administrator can activate the user administration for the meter. The user
administration is activated with the MultiLab User software (see enclosed
CD-ROM).
Using <ESC>, you can go to the Start menu from the measuring
mode.
If the user administration function is activated, the Login dialog
appears after the meter is switched on (see section 4.2).
The user administration function is not active in the delivery condi-
tion.
The user administration is activated by the administrator via the PC
software MultiLab User (see MultiLab User operating manual).
Turbidity
i Turb®750 IR V 2.21
Start
i Insert sample
i Press and hold <START>
i Align sample
Turbidity

Operation Turb®750 IR/T
14 ba77233e05 06/2023
When user administration is active, every user has to log in with a user name.
The assigned authorization level determines which settings and function a
user is allowed to use.
4.3 Login with user name
Functions of the MultiLab User PC software:
Activate the user administration for the meter
Create a user name
Assign authorization levels
Assign password protection (optional)
Authorization level
Function
012
Calibration settings 
AQA settings 
Reset in the Turbidity
menu

Reset in the System menu 
Erase the measured value
memory

1. Switch the meter on with <On/Off>.
The Login dialog appears.
In the User name menu, all created user names are listed.
2. Using <V><W>, select the menu item, User name and confirm with
<START/ENTER (.) >.
The user name is highlighted.
User name Admin
Password ####
Change password
Login

Turb®750 IR/T Operation
15
ba77233e05 06/2023
Changing the
password
If the administrator has set up the access with password protection:
3. Using <V><W>, select a user name and confirm with <START/
ENTER (.) >.
The login is done immediately if no password is required.
4. If a password is required:
Using <V><W>, select the menu item, Password and confirm with
<START/ENTER (.) >.
The user specifies the password when he or she first logs in with
a user name.
A valid password consists of 4 digits.
The user can change the password with the next login.
5. Enter the password with the numeric keys.
When the password was completely entered, confirm with <START/
ENTER (.) >.
The login takes place.
1. Switch the meter on with <On/Off>.
The Login dialog appears.
2. Using <V><W>, select the menu item, User name and confirm with
<START/ENTER (.) >.
The user name is highlighted.
3. Using <V><W>, select a user name and confirm with <START/
ENTER (.) >.
4. Using <V><W>, select the menu item, Change password and con-
firm with <START/ENTER (.) >.
5. In the Password field, enter the old password with the numeric keys
and confirm with <START/ENTER (.) >.
6. In the New password field, enter the new password with the numeric
keys and confirm with <START/ENTER (.) >.
The password is changed.
7. Quit the Change password menu with <ESC>.
The Login dialog appears.

Operation Turb®750 IR/T
16 ba77233e05 06/2023
Forgotten the
password?
Contact the administrator.
4.4 Inserting a cell
Before using a cell for the first time, determine and mark the suitable measur-
ing position for the cell (see section 4.5.1).
Inserting a 28 mm
cell
4.5 Preparing the cell and sample
Standard solutions and test samples are filled into cells for calibration and tur-
bidity measurement with the Turb®750 IR/T.
1 Push the dust cover (1) upward.
The cell shaft for 28 mm cells is open.
1
2 Insert the marked cell so that it is positioned on the bottom of the cell
shaft.
3 Align the cell marking (3) with the marking (4) of the cell shaft.
The cell is ready to be measured.
3
4

Turb®750 IR/T Operation
17
ba77233e05 06/2023
The quality of the measured values depends on the optimum preparation of
the cell and sample.
Preparing the cell (see section 4.5.1)
– Determine a suitable position in the cell shaft
– Marking a cell
Preparing the sample (see section 4.5.2)
4.5.1 Preparing the cell
Even completely clean quality cells exhibit tiny differences in their light trans-
mittance, e.g. inhomogeneities of the glass or small defects (e.g. scratches).
Therefore, guidelines for accurate and reproducible measurements (e.g. US
EPA) recommend that you always align the cell in the same way for measur-
ing with the aid of arrows printed on or markings. This refers to sample cells
and cells for calibration standards.
Prior to using a cell for the first time, the suitable position of the cell in the cell
shaft is determined and marked to make sure the optical path is not dis-
turbed. For the following measurements, the cell marking can just be aligned
with the meter marking.
The cell marking should be checked regularly and renewed as necessary.
The cell can be used until no suitable position for the optical path can be
found.
We recommend that you do not treat any scratches in the cell
with oily liquids (not even with so-called "special silicone oils").
They could unnecessarily soil the meter and your working envi-
ronment. The optimum measurement accuracy is ensured by
aligning the cells. Scratched cells have to be replaced.
1 Clean the cell (see section 5.2.2).
2 Stick the label for the marking onto the cell cap.
3 Fill the cell with a homogeneous solution (e.g. calibration standard
10.0 NTU).
4 Insert the cell (see section 4.4).

Operation Turb®750 IR/T
18 ba77233e05 06/2023
Determining a suit-
able position in the
cell shaft
Marking a cell
4.5.2 Preparing the sample
Venting the
sample
Air bubbles in the sample affect the measuring result to a massive extent be-
cause they have a large scattering effect on the incident light. Larger air bub-
bles cause sudden changes in the measured values whereas smaller air
bubbles are recorded by the instrument as turbidity. Therefore, avoid or re-
move air bubbles:
Avoiding or
removing
air bubbles
During sampling, ensure all movement is kept to a minimum
If necessary, vent the sample (ultrasonic baths, heating or adding a sur-
face-active substance to reduce the surface tension)
4.6 General operating principles
This section contains basic information on the operation of the Turb®750 IR/
T.
Operating
elements,
display
An overview of the operating elements and the display is given in section 1.2
and section 1.3.
Operating modes,
navigation
An overview of the operating modes of the Turb®750 IR/T and the navigation
through menus and functions can be found in section 4.6.1 and section 4.6.2.
5Press and keep the <START/ENTER (.) > key depressed.
Turn the cell slowly and check the measured value:
– The measured value at the position should be no maximum.
– At the directly neighboring positions there should not be any
sudden changes of the measured values. The deviations of
measured values at the neighboring positions should not ex-
ceed the following values:
Measured value < 1 NTU: max. +/- 0.02 NTU
Measured value > 1 NTU: max. +/- 2 %
6 Release the <START/ENTER (.) > key.
Measurement starts. The measured value is displayed.
7 Mark the determined position (aligning) of the cell on the label.
The cell is now prepared for all following measuring and calibration
actions.

Turb®750 IR/T Operation
19
ba77233e05 06/2023
4.6.1 Operating modes
The instrument has the following operating modes:
Measurement
The display indicates measurement data in the measured value display
Calibration
The display indicates a calibration procedure with calibration information
Data transmission
The meter transmits measuring datasets or calibration records to the in-
terface
Configuration
The display indicates a menu with further menus, settings and functions
4.6.2 Navigation
Measured value
display
In the measured value display, open the menu with <MENU (7) >.
Menus and dialogs The menus for settings and dialogs in procedures contain further subele-
ments. The selection is done with the keys <V><W>.
The current selection is displayed inverse.
Menus
The name of the menu is displayed at the upper edge of the frame. Menus
are opened by confirming with <START/ENTER (.) >. Example:
Settings
Settings are indicated by a colon. The current setting is displayed on the
right-hand side. With <START/ENTER (.) >, the selection of the possible
settings is opened. Then the setting can be selected with <V><W> and
confirmed with <START/ENTER (.) >.
Example:
Turbidity
Timer
System
Measured value memory
Configuration

Operation Turb®750 IR/T
20 ba77233e05 06/2023
Functions
Functions are designated by the name of the function. They are immedi-
ately carried out when you confirm them with <START/ENTER (.) >.
Example: display the Calibr. record function
(in the Turbidity menu).
Messages
Information or operating instructions are designated by the i symbol.
They cannot be selected.
Example:
The principles of navigation are explained in the two following
sections by reference of examples:
Setting the language (section 4.6.3)
Setting the date and time (see section 4.6.4).
Language:Deutsch
Info
Display
Reset
Interface
Continue ...
System
Calibr. record
Calibr. type 3-P StdCAL
Calibr. interval:90 d
Lot number
Calibration
i 3-P StdCAL
i Insert standard:
1000 FNU/NTU
i Press and hold <START>
i Align sample
Turbidity Calibration
The i indicates
info texts, e.g.
messages, notes or instruc-
tions